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Dual polarized ambidextrous multiple deformed aperture spiral antennas

  • US 5,227,807 A
  • Filed: 11/29/1989
  • Issued: 07/13/1993
  • Est. Priority Date: 11/29/1989
  • Status: Expired due to Term
First Claim
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1. An antenna group occupying a substantially circular area, comprising a plurality of spiral antenna disposed adjacent one another, radially symmetrically arranged about the centerpoint of the circular area, each spiral antenna comprising a pair of windings arranged in a spaced, interleaved configuration, each winding having a feed point at a first end of the spiral antenna, each spiral antenna being symmetrically deformed to occupy the area within a sector of the circular area such that the length of each winding of each antenna measured from a second end of the spiral antenna remote from the feed points in a direction along said winding from said second end toward said first end to the point where the winding first intersects a radius extending from said second end to a midpoint between each windings feed points is not less than 0.75 times the circumference of the circular area, the windings being arranged to yield a stable phase center located at said midpoint, wherein the windings of at lest one of the spiral antennas are generally Archimedean spirals in the vicinity of the feed points of the spiral antenna and generally logarithmic sprials in the vicinity of said second end of the spiral antenna.

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